Properties of foamed concrete with Ca(OH)2 as foam stabilizer

Abstract In this study, the Ca(OH)2 has been utilized as foam stabilizer to improve the stability of fresh foam and thus, better the properties of foamed concrete. Meanwhile, optical microscopy (OM), X-ray computed tomography (XCT), TG/DSC, FTIR, and scanning electron microscopy (SEM) are used to investigate the stabilization mechanisms. Experimental results reveal that stabilization using Ca(OH)2 can retard the disproportionation and coalescence of the bubbles by the reaction of alumina on the bubble surface with Ca(OH)2, thus hindering physical drainage and improving the stability of the foam. The early age strength of foamed concrete could be improved with the inclusion of Ca(OH)2 in the foam. In addition, a finer and more homogeneous pore structure could be achieved with the incorporation of the appropriate amount of Ca(OH)2 in the foam, which accounts for the better performance of the foamed concrete.